THAT和OF WHAT，，大家帮帮我～～～～～～～救命

chaomat1988

A new hair-growingdrug is being sold for three times the price, per milligram, as thedrug’s maker charges for another product with the same active ingredient.

A.   as
B.   than
C.   that
D.   of what
E.    at which
答案是C，，为什么D不行呢？ 是因为后半句不缺少成份吗 所以不用WHAT？ 请高人帮忙透彻分析下

Gail小M

c:  that clause modifies the "RICE"

D:three times< the price of > what the drug’s maker charges for another product with the same active ingredient

"what...charges" can already refer the price, while U add  of"before what --->illogically suggest the price of a price

PS： <What> caused the accident is still a complete mystery--<The reasons that> caused....mystery(what->The noun that )
thus the what clause can already refer to a noun.

chaomat1988

这里THAT是指带吗？ 还是重句啊 应该是个重句吧

jeanq

前面已经有price啦，that 指代price
three times the price that the drug's maker charges…~
what没有必要啊= =不知道我这么说你清不清楚 = =~